How does the shape and surface energy of pores affect the
This work shows the effect that different pore geometries pore sizes and fluid–solid energy interactions have on the adsorption of fluids in nanoconfinement. At pore sizes equal (or larger) than 4 nm (the "large" pores in this work roughly 13 times the molecular diameter) the effects of the specific pore shape starts to become irrelevant.
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How does the shape and surface energy of pores affect the
This work shows the effect that different pore geometries pore sizes and fluid–solid energy interactions have on the adsorption of fluids in nanoconfinement. At pore sizes equal (or larger) than 4 nm (the "large" pores in this work roughly 13 times the molecular diameter) the effects of the specific pore shape starts to become irrelevant.
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Effect of solid-H2S gas reactions on CZTSSe thin film
The kinetics of the VLS mechanism consists of four steps (1) mass transport in the gas phase (2) chemical reaction at the vapour–liquid interface (3) diffusion in the liquid phase and (4) incorporation of atoms into a crystal lattice. 31 During the mass transport in the gas phase the Zn content of the Sn–Zn alloy liquid droplets can be
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(PDF) Pore-scale modeling of the reactive transport of
Due to the computational expense of a detailed pore-scale d˜skO 2 2 reactive transport model only a small section of the cathode can ci 1 − ˜ kO − ˜ kCr O − ˜O = kO − kO k be modeled at the pore-scale and a cell level model of the SOFC dt i ∈ gas is required to establish the boundary conditions at the external boundaries of the
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Effect of Density and Porosity on the Durability of Flyash
The solid-to-solid distance between the C-S-H layer (gel pore) is found to vary between 5 to 25 A (1 A = 10-5 mm). Due to their size these pores can influence drying shrinkage and creep behaviour of concrete. Compared to C-S-H crystals greater pore sizes are observed between the solid of Ca(OH)2 and calcium sulfoaluminate crystals.
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Solid Oxide Fuel Cell Ni–YSZ Anodes Effect of Composition
Jul 23 2008 · The model does not consider the possibility of gas diffusivity losses or unconnected Ni particles. For example decreasing the Ni content to a sufficiently low value will increase the fraction of isolated Ni particles and voids. For the lowest Ni content with only Ni and pore the fraction of TPBs with unconnected Ni and pores may be
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Thermodynamic Investigation of the Effect of Interface
Jul 23 2017 · solid−liquid phase diagram across the entire composition range for any arbitrary binary solution that forms pure solids including the effect of the contact angle at which the solid− liquid interface contacts a confining pore wall. 1.2. Solid−Liquid Phase Diagrams in the Absence of Curvature. Solid−liquid phase diagrams can have many
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WettingWikipedia
Wetting is the ability of a liquid to maintain contact with a solid surface resulting from intermolecular interactions when the two are brought together. The degree of wetting (wettability) is determined by a force balance between adhesive and cohesive forces.Wetting deals with three phases of matter gas liquid and solid.
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Thermodynamic Investigation of the Effect of Interface
Jul 23 2017 · solid−liquid phase diagram across the entire composition range for any arbitrary binary solution that forms pure solids including the effect of the contact angle at which the solid− liquid interface contacts a confining pore wall. 1.2. Solid−Liquid Phase Diagrams in the Absence of Curvature. Solid−liquid phase diagrams can have many
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Cell wall microstructure pore size distribution and
It indicates that the microstructure of the cell wall has a significant effect on the density obtained. It also indicates that the displacement liquid achieves a lower penetration in hemp shiv due to the complexity of the pore structure. Repeat experiments in all cases resulted in a maximum observed deviation of 0.5 from the mean density value.
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Tailoring the Microstructure of a Solid Oxide Fuel Cell
Jun 07 2016 · The effect of gas diffusion using infiltrated electrodes was The anode microstructure shows the pores formed due to the burning of the graphite pore-former (slit shaped pores) and smaller
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1. IntroductionHindawi
Considering the wall adhesion effect the contact angle between the solid surface and the fluid is adopted to modify the unit normal (n ) of phase interface nearby the surface (9) n = n w cos θ w t w sin θ w where n w is the unit vectors normal to the wall and t w is tangential to the wall respectively and θ w is the
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Solid Oxide Fuel Cell Ni–YSZ Anodes Effect of Composition
Jul 23 2008 · The model does not consider the possibility of gas diffusivity losses or unconnected Ni particles. For example decreasing the Ni content to a sufficiently low value will increase the fraction of isolated Ni particles and voids. For the lowest Ni content with only Ni and pore the fraction of TPBs with unconnected Ni and pores may be
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Effects of pore formers on microstructure and performance
The microstructure indicates that graphite results in a porous LSCF cathode with a large surface area and high porosity which can offer a considerably long triple phase boundary for catalytic reactions as well as channels for gas phase transport.
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Effects of processing parameters on microstructure and
Therefore in this work the effects of three main processing parameters such as punch speed reheating temperature and reheating time on the microstructure especially the pores resulted from insufficient filling solidification shrinkage or gas of thixo-die-casting AM60B magnesium alloy have been studied.
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(PDF) Microstructure Effects on Effective Gas Diffusion
of the interaction between gas molecules and solid wall in Knudsen diffusion (2) the 13- length averaging method will much overestimate the pore diameter of the slender pores with a large length
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Tailoring the Microstructure of a Solid Oxide Fuel Cell
Jun 07 2016 · The effect of gas diffusion using infiltrated electrodes was The anode microstructure shows the pores formed due to the burning of the graphite pore-former (slit shaped pores) and smaller
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Effects of the Microstructure of Fibrous Media on their
Effects of the Microstructure of Fibrous Media on their Acoustic Properties C. Peyrega 1 and D. Jeulin1 1Center of Mathematical Morphology Mathematics and Systems Mines ParisTech Charles Peyrega 1Center of Mathematical Morphology 35 Rue St-Honoré 77300 Fontainebleau (France) charles.peyrega cmm.ensmp.fr Abstract This study is a part of the Silent WallA
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Materials Free Full-Text Reactivity and Microstructure
Pores in the range of 10 nm–20 nm are also reduced but with a lower magnitude. The proportion of bigger pores increases accordingly. The influence of l/s ratio shows a similar trend as higher ratios lead to an increase in bigger pores. Nevertheless compared to the effect of fly ash the effect
Get PriceCoke microstructure and strength under blast furnace
Metallurgical cokes are highly porous materials. Coke strength is dependent on both pore structure and the microstrength of pore wall components 1-3 . Gas-solid reactions and mineral matter reactions impact the pore structure while graphitisation (annealing) reduces the microstrength of the pore walls.
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Self-healable sticky porous elastomer for gas-solid
A previously unknown gas-solid interacted power generation is developed using triboelectric effect. We designed an adhesive gas-tight and self-healing supramolecular polysiloxane-dimethylglyoxime–based polyurethane (PDPU) porous elastomer based on segmented oxime-carbamate-urea. It is an intrinsically triboelectric negative material with trapped air within closed voids exhibiting
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Exuding porous media deviations from Darcy s law
By converting five moles of gas into three or conversely it induces a velocity at the surface directed towards or away from the solid respectively. Fluxes at the pore–solid interface can also result from phase changes. Interesting examples are provided by the water ice–vapour system with sublimation and/or condensation at the solid
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Tailoring the Microstructure of a Solid Oxide Fuel Cell
Jun 07 2016 · The effect of gas diffusion using infiltrated electrodes was The anode microstructure shows the pores formed due to the burning of the graphite pore-former (slit shaped pores) and smaller
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(PDF) Effects of Porous Support Microstructure on
Effects of Porous Support Microstructure on Performance of Infiltrated Electrodes in Solid Oxide Fuel Cells. Journal of The Electrochemical Society 2012. Amir Hanifi. Thomas Etsell. P. Sarkar. A. Torabi. Amir Hanifi. Thomas Etsell.
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An Anisotropic Microstructure Evolution in a Solid Oxide
Jan 03 2020 · The presented research shows that the long-term operation of a solid oxide fuel cell can lead to substantial anisotropic changes in anode material. The morphology of microstructure in the investigated stack was observed before and after the aging test using electron nanotomography. The microstructural parameters were estimated based on the obtained digital representation of the anode
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How does the shape and surface energy of pores affect the
This work shows the effect that different pore geometries pore sizes and fluid–solid energy interactions have on the adsorption of fluids in nanoconfinement. At pore sizes equal (or larger) than 4 nm (the "large" pores in this work roughly 13 times the molecular diameter) the effects of the specific pore shape starts to become irrelevant.
Get PriceMicrostructure of Concrete IntechOpen
Oct 27 2015 · The microstructure of concrete can be described in the following three aspects (i) hydrated cement paste which represents the hydration products of cement and water reaction and the main product of this reaction is the calcium silicate hydrate (C-S-H) gel (ii) pore structure which refers to the gel pores capillary pores and voids and
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Effects of solid loading on pore structure and properties
Feb 15 2019 · Solid loading as a key parameter in gel casting influence both rheological behavior and stability of slurry. It also has strong impacts on microstructure and final properties of porous FeAl intermetallics. In this study a designed non-aqueous gel casting has been developed for fabrication of porous FeAl intermetallics.
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Cell wall microstructure pore size distribution and
It indicates that the microstructure of the cell wall has a significant effect on the density obtained. It also indicates that the displacement liquid achieves a lower penetration in hemp shiv due to the complexity of the pore structure. Repeat experiments in all cases resulted in a maximum observed deviation of 0.5 from the mean density value.
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